JSHint is a community-driven tool to detect errors and potential problems in JavaScript code. It is very flexible so you can easily adjust it to your particular coding guidelines and the environment you expect your code to execute in.

RuboCop is a Ruby static code analyzer. Out of the box it will enforce many of the guidelines outlined in the community Ruby Style Guide.

JavaScript Code Style checker

JavaScript Standard Style

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. In many ways, it is similar to JSLint and JSHint with a few exceptions:

• ESLint uses Esprima for JavaScript parsing.
• ESLint uses an AST to evaluate patterns in code.
• ESLint is completely pluggable, every single rule is a plugin and you can add more at runtime.

ShellCheck, a static analysis tool for shell scripts. Automatically detects problems with sh/bash scripts and commands.

CSSLint is a tool to help point out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problematic patterns or signs of inefficiency. The rules are all pluggable, so you can easily write your own or omit ones you don't want.

scss-lint is a tool to help keep your SCSS files clean and readable.

CSS coding style formatter

Simple Python style checker in one Python file

This is a linter for Go source code.

A static source code analysis tool to improve quality and reduce defects for C, C++ and Objective-C

HTMLHint is a Static Code Analysis Tool for HTML, you can use it with IDE or in build system.

Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.

CoffeeLint is a style checker that helps keep CoffeeScript code clean and consistent. CoffeeScript does a great job at insulating programmers from many of JavaScript's bad parts, but it won't help enforce a consistent style across a code base. CoffeeLint can help with that.

A framework for managing and maintaining multi-language pre-commit hooks.

Check that your Puppet manifest conform to the style guide. The goal of this project is to implement as many of the recommended Puppet style guidelines from the Puppet Labs style guide as practical.

HLint is a tool for suggesting possible improvements to Haskell code. These suggestions include ideas such as using alternative functions, simplifying code and spotting redundancies.

Erlang Style Reviewer